﻿// --------------------------------------------------------------------------------------------
// <copyright file="TransformVisitor.Property.cs" company="Effort Team">
//     Copyright (C) 2011-2014 Effort Team
//
//     Permission is hereby granted, free of charge, to any person obtaining a copy
//     of this software and associated documentation files (the "Software"), to deal
//     in the Software without restriction, including without limitation the rights
//     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//     copies of the Software, and to permit persons to whom the Software is
//     furnished to do so, subject to the following conditions:
//
//     The above copyright notice and this permission notice shall be included in
//     all copies or substantial portions of the Software.
//
//     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//     THE SOFTWARE.
// </copyright>
// --------------------------------------------------------------------------------------------

namespace Effort.Internal.DbCommandTreeTransformation
{
#if !EFOLD
    using System.Data.Entity.Core.Common.CommandTrees;
#else
    using System.Data.Common.CommandTrees;
#endif
    using System.Linq.Expressions;
    using Effort.Internal.Common;

    internal partial class TransformVisitor
    {
        public override Expression Visit(DbPropertyExpression expression)
        {
            string propertyName = expression.Property.GetColumnName();

            Expression sourceExpression = this.Visit(expression.Instance);
            Expression result = Expression.Property(sourceExpression, propertyName);

            // Every property access result is nullable in SQL
            // Check if the propery type is not nullable
            if (result.Type.IsValueType && !TypeHelper.IsNullable(result.Type))
            {
                // Make it nullable
                result = Expression.Convert(result, TypeHelper.MakeNullable(result.Type));
            }

            return result;
        }
    }
}